Ext.device.Push

noticed this in the 2.1 rc docs.
what exactly does it do? its hard to understand from the docs. the docs simply say "Provides a way to send push notifications to a device"can someone please elaborate or give a use case on when to use this?
thanks!

Sencha touch push notification

I recently started developing with Sencha Touch 2, at the moment i'm creating an app that needs support for Apple Push Notifications.

So I've created the neccesary certificates at the Apple developer center and used them to package the application with the Sencha Touch SDK tools. All went well and I'm able to run this app on my device.

In the app I added a button to receive the device token. When I tap the button it executes the following code

This is the code i get from sencha docs. Bud i dont have much success yet.. please direct me to solve this issue.. Thanks in advance